[PATCH 0/2] MR76: ntdll: Set up 32-bit segments to support Wow64 on macOS 10.15+.
- signal_alloc_thread() and signal_free_thread() mostly match signal_i386.c, but with the difference that first thread’s FS needs to be allocated in signal_init_process(). signal_alloc_thread() is called too early before the Wow TEB is allocated. - The LDT code is copied from signal_i386.c. Would it be worthwhile to move that into a common file? -- https://gitlab.winehq.org/wine/wine/-/merge_requests/76
From: Brendan Shanks <bshanks(a)codeweavers.com> Signed-off-by: Brendan Shanks <bshanks(a)codeweavers.com> --- dlls/ntdll/unix/signal_x86_64.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index 34334f72ff0..ab05a957630 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -367,6 +367,7 @@ struct amd64_thread_data void *exit_frame; /* 0320 exit frame pointer */ struct syscall_frame *syscall_frame; /* 0328 syscall frame pointer */ void *pthread_teb; /* 0330 thread data for pthread */ + DWORD fs; /* 0338 WOW TEB selector */ }; C_ASSERT( sizeof(struct amd64_thread_data) <= sizeof(((struct ntdll_thread_data *)0)->cpu_data) ); @@ -2008,7 +2009,7 @@ NTSTATUS set_thread_wow64_context( HANDLE handle, const void *ctx, ULONG size ) { wow_frame->SegDs = ds64_sel; wow_frame->SegEs = ds64_sel; - wow_frame->SegFs = fs32_sel; + wow_frame->SegFs = amd64_thread_data()->fs; wow_frame->SegGs = ds64_sel; } if (flags & CONTEXT_I386_DEBUG_REGISTERS) @@ -2355,7 +2356,7 @@ NTSTATUS WINAPI KeUserModeCallback( ULONG id, const void *args, ULONG len, void callback_frame.frame.rdx = (ULONG_PTR)args; callback_frame.frame.r8 = len; callback_frame.frame.cs = cs64_sel; - callback_frame.frame.fs = fs32_sel; + callback_frame.frame.fs = amd64_thread_data()->fs; callback_frame.frame.gs = ds64_sel; callback_frame.frame.ss = ds64_sel; callback_frame.frame.rsp = (ULONG_PTR)args_data - 0x28; @@ -2866,6 +2867,13 @@ void signal_init_threading(void) */ NTSTATUS signal_alloc_thread( TEB *teb ) { + struct amd64_thread_data *thread_data = (struct amd64_thread_data *)&teb->GdiTebBatch; + + if (teb->WowTebOffset) + { + if (fs32_sel) + thread_data->fs = fs32_sel; + } return STATUS_SUCCESS; } @@ -2998,7 +3006,7 @@ void signal_init_process(void) cs32_sel = 0x23; if ((sel = alloc_fs_sel( -1, teb32 )) != -1) { - fs32_sel = (sel << 3) | 3; + amd64_thread_data()->fs = fs32_sel = (sel << 3) | 3; syscall_flags |= SYSCALL_HAVE_PTHREAD_TEB; if (getauxval( AT_HWCAP2 ) & 2) syscall_flags |= SYSCALL_HAVE_WRFSGSBASE; } @@ -3051,7 +3059,7 @@ void DECLSPEC_HIDDEN call_init_thunk( LPTHREAD_START_ROUTINE entry, void *arg, B context.SegCs = cs64_sel; context.SegDs = ds64_sel; context.SegEs = ds64_sel; - context.SegFs = fs32_sel; + context.SegFs = thread_data->fs; context.SegGs = ds64_sel; context.SegSs = ds64_sel; context.EFlags = 0x200; -- GitLab https://gitlab.winehq.org/wine/wine/-/merge_requests/76
From: Brendan Shanks <bshanks(a)codeweavers.com> Signed-off-by: Brendan Shanks <bshanks(a)codeweavers.com> --- dlls/ntdll/unix/signal_x86_64.c | 144 +++++++++++++++++++++++++++++++- 1 file changed, 142 insertions(+), 2 deletions(-) diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index ab05a957630..799df1b5972 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -208,6 +208,8 @@ __ASM_GLOBAL_FUNC( alloc_fs_sel, #elif defined (__APPLE__) +#include <i386/user_ldt.h> + #define RAX_sig(context) ((context)->uc_mcontext->__ss.__rax) #define RBX_sig(context) ((context)->uc_mcontext->__ss.__rbx) #define RCX_sig(context) ((context)->uc_mcontext->__ss.__rcx) @@ -432,6 +434,9 @@ static inline void context_init_xstate( CONTEXT *context, void *xstate_buffer ) } static USHORT cs32_sel; /* selector for %cs in 32-bit mode */ +#ifdef __APPLE__ +static USHORT ds32_sel; /* selector for %ds in 32-bit mode */ +#endif static USHORT cs64_sel; /* selector for %cs in 64-bit mode */ static USHORT ds64_sel; /* selector for %ds/%es/%ss in 64-bit mode */ static USHORT fs32_sel; /* selector for %fs in 32-bit mode */ @@ -2833,6 +2838,80 @@ static void usr1_handler( int signal, siginfo_t *siginfo, void *ucontext ) } +/*********************************************************************** + * LDT support + */ + +#define LDT_SIZE 8192 + +#define LDT_FLAGS_DATA 0x13 /* Data segment */ +#define LDT_FLAGS_CODE 0x1b /* Code segment */ +#define LDT_FLAGS_32BIT 0x40 /* Segment is 32-bit (code or stack) */ +#define LDT_FLAGS_ALLOCATED 0x80 /* Segment is allocated */ + +static ULONG first_ldt_entry = 32; + +struct ldt_copy +{ + void *base[LDT_SIZE]; + unsigned int limit[LDT_SIZE]; + unsigned char flags[LDT_SIZE]; +} __wine_ldt_copy; + +static pthread_mutex_t ldt_mutex = PTHREAD_MUTEX_INITIALIZER; + +static inline void *ldt_get_base( LDT_ENTRY ent ) +{ + return (void *)(ent.BaseLow | + (ULONG_PTR)ent.HighWord.Bits.BaseMid << 16 | + (ULONG_PTR)ent.HighWord.Bits.BaseHi << 24); +} + +static inline unsigned int ldt_get_limit( LDT_ENTRY ent ) +{ + unsigned int limit = ent.LimitLow | (ent.HighWord.Bits.LimitHi << 16); + if (ent.HighWord.Bits.Granularity) limit = (limit << 12) | 0xfff; + return limit; +} + +static LDT_ENTRY ldt_make_entry( void *base, unsigned int limit, unsigned char flags ) +{ + LDT_ENTRY entry; + + entry.BaseLow = (WORD)(ULONG_PTR)base; + entry.HighWord.Bits.BaseMid = (BYTE)((ULONG_PTR)base >> 16); + entry.HighWord.Bits.BaseHi = (BYTE)((ULONG_PTR)base >> 24); + if ((entry.HighWord.Bits.Granularity = (limit >= 0x100000))) limit >>= 12; + entry.LimitLow = (WORD)limit; + entry.HighWord.Bits.LimitHi = limit >> 16; + entry.HighWord.Bits.Dpl = 3; + entry.HighWord.Bits.Pres = 1; + entry.HighWord.Bits.Type = flags; + entry.HighWord.Bits.Sys = 0; + entry.HighWord.Bits.Reserved_0 = 0; + entry.HighWord.Bits.Default_Big = (flags & LDT_FLAGS_32BIT) != 0; + return entry; +} + +static void ldt_set_entry( WORD sel, LDT_ENTRY entry ) +{ + int index = sel >> 3; + +#if defined(__APPLE__) + if (i386_set_ldt(index, (union ldt_entry *)&entry, 1) < 0) perror("i386_set_ldt"); +#else + fprintf( stderr, "No LDT support on this platform\n" ); + exit(1); +#endif + + __wine_ldt_copy.base[index] = ldt_get_base( entry ); + __wine_ldt_copy.limit[index] = ldt_get_limit( entry ); + __wine_ldt_copy.flags[index] = (entry.HighWord.Bits.Type | + (entry.HighWord.Bits.Default_Big ? LDT_FLAGS_32BIT : 0) | + LDT_FLAGS_ALLOCATED); +} + + /********************************************************************** * get_thread_ldt_entry */ @@ -2871,8 +2950,25 @@ NTSTATUS signal_alloc_thread( TEB *teb ) if (teb->WowTebOffset) { - if (fs32_sel) - thread_data->fs = fs32_sel; + if (!fs32_sel) + { + void *teb32 = (char *)teb + teb->WowTebOffset; + sigset_t sigset; + int idx; + LDT_ENTRY entry = ldt_make_entry( teb32, page_size - 1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT ); + + server_enter_uninterrupted_section( &ldt_mutex, &sigset ); + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + ldt_set_entry( (idx << 3) | 7, entry ); + break; + } + server_leave_uninterrupted_section( &ldt_mutex, &sigset ); + if (idx == LDT_SIZE) return STATUS_TOO_MANY_THREADS; + thread_data->fs = (idx << 3) | 7; + } + else thread_data->fs = fs32_sel; } return STATUS_SUCCESS; } @@ -2883,6 +2979,15 @@ NTSTATUS signal_alloc_thread( TEB *teb ) */ void signal_free_thread( TEB *teb ) { + struct amd64_thread_data *thread_data = (struct amd64_thread_data *)&teb->GdiTebBatch; + sigset_t sigset; + + if (teb->WowTebOffset && !fs32_sel) + { + server_enter_uninterrupted_section( &ldt_mutex, &sigset ); + __wine_ldt_copy.flags[thread_data->fs >> 3] = 0; + server_leave_uninterrupted_section( &ldt_mutex, &sigset ); + } } #ifdef __APPLE__ @@ -3012,6 +3117,41 @@ void signal_init_process(void) } else ERR_(seh)( "failed to allocate %%fs selector\n" ); } +#elif defined(__APPLE__) + if (NtCurrentTeb()->WowTebOffset) + { + void *teb32 = (char *)NtCurrentTeb() + NtCurrentTeb()->WowTebOffset; + LDT_ENTRY cs32_entry, ds32_entry, fs32_entry; + int idx; + + cs32_entry = ldt_make_entry( NULL, -1, LDT_FLAGS_CODE | LDT_FLAGS_32BIT ); + ds32_entry = ldt_make_entry( NULL, -1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT ); + fs32_entry = ldt_make_entry( teb32, page_size - 1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT ); + + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + cs32_sel = (idx << 3) | 7; + ldt_set_entry( cs32_sel, cs32_entry ); + break; + } + + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + ds32_sel = (idx << 3) | 7; + ldt_set_entry( ds32_sel, ds32_entry ); + break; + } + + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + amd64_thread_data()->fs = (idx << 3) | 7; + ldt_set_entry( amd64_thread_data()->fs, fs32_entry ); + break; + } + } #endif sig_act.sa_mask = server_block_set; -- GitLab https://gitlab.winehq.org/wine/wine/-/merge_requests/76
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Brendan Shanks (＠bshanks)